编写程序相加两个分数，并将它们的和以化简后的分数形式表现出来。程序使用类Fraction来存放分数的分子和分母，具有方法Reduce来化简结果。-Program to add two scores, and they and the simplification of the fraction form. Procedures for the use of class Fraction to store the fractional molecule and denominator, with Reduce method to simplify the results